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Atmospheric Pressure

Atmospheric Pressure

  • Although there are various kinds of pressure, pilots are mainly concerned with atmospheric pressure.
  • It is one of the basic factors in weather changes or heatwave, helps to lift an aircraft and actuates some of the important fl ight instruments.
  • These instruments are the altimeter, airspeed indicator, vertical speed indicator, and manifold pressure gauge.
  • Air is very light, but it has mass and is affected by the attraction of gravity or gravity discovery. Therefore, like any other substance, it has weight, and because of its weight, it has force.
  •  Since it is a fluid substance, this force is exerted equally in all directions, and its effect on bodies within the air is called pressure.
  •  Under standard conditions at sea level, the average pressure exerted by the weight of the atmosphere is approximately 14.70 pounds per square inch (psi) of surface, or 1,013.2 millibars (mb).
  •  Its thickness is limited; therefore, the higher the altitude near me, the less air there is above. For this reason, the weight of the atmosphere at 18,000 feet is one-half what it is at sea level.
  •  The pressure of the atmosphere varies with time and location. Due to the changing atmospheric pressure, a standard reference was developed.
  •  The the standard atmosphere at sea level is a surface current temp of 59 °F or 15 °C and a surface pressure of 29.92 inches of mercury ("Hg), or 1,013.2 mb.

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